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@Alex > There are many reasons why that might occur, including the antivirus, drive indexing, or even Cortana (running in the background if you haven't disabled her).
Check this article for tips on troubleshooting / cleaning your system.
If you still have troubles with crashing, you may consider switching the primary graphics chipset being used by rekordbox (if you have multiple). Failing that, file a ticket and our rekordbox team will assist you with some further troubleshooting and diagnostics.